共查询到20条相似文献，搜索用时 15 毫秒
1.
在自适应光学系统中，波前探测器的噪声、未完全补偿湍流所引起的误差以及变形镜的拟合误差是主要的误差源．本文针对已经建立的2．16m望远镜红外自适应光学系统，从伺服控制系统的角度分析了该系统的闭环噪声、大气湍流引起的误差以及该系统的闭环总体误差．该系统的闭环总体误差是光强及系统闭环带宽的函数．本文还分析了该系统的有效性以及对大气湍流不同改善程度情况下光强与闭环带宽的关系．并在此基础上给出了该系统的最佳带宽选取及系统的极限工作星等． 相似文献
2.
Yong-Tian Zhu Jiang-Pei Dou Xi Zhang Gang Zhao Jing Guo Leopoldo Infante 《天文和天体物理学研究(英文版)》2021,(4):32-40
The portable adaptive optics(PAO) device is a low-cost and compact system,designed for 4-meter class telescopes that have no adaptive optics(AO) system,because of the physical space limitation at the Nasmyth or Cassegrain focus and the historically high cost of conventional AO.The initial scientific observations of the PAO are focused on the direct imaging of exoplanets and sub-stellar companions.This paper discusses the concept of PAO and the associated high-contrast imaging performance in our recent observational runs.PAO deliver a Strehl ratio better than 60% in H band under median seeing conditions of 1 ".Combined with our dedicated image rotation and subtraction(IRS) technique and the optimized IRS(O-IRS) algorithm,the averaged contrast ratio for a 5 ≤V_(mag)≤9 primary star is 1.3×10~(-5) and3.3×10~(-6) at angular distance of 0.36" with exposure time of 7 minutes and 2 hours,respectively.PAO has successfully revealed the known exoplanet of κ And b in our recent observation with the 3.5-meter ARC telescope at Apache Point Observatory.We have performed the associated astrometry and photometry analysis of the recovered κ And b planet,which gives a projected separation of 0.98 "±0.05",a position angle of 51.1°±0.5° and a mass of 10.15_(-1.255) ~(+2.19) M_(Jup).These results demonstrate that PAO can be used for direct imaging of exoplanets with medium-sized telescopes. 相似文献
3.
J.-L. Beuzit L. Demailly E. Gendron P. Gigan F. Lacombe D. Rouan N. Hubin D. Bonaccini E. Prieto F. Chazallet D. Rabaud P.-Y. Madec G. Rousset R. Hofmann F. Eisenhauer 《Experimental Astronomy》1997,7(4):285-292
ADONIS is an adaptive optics (AO) user friendly instrument offered to the European astronomical community on the ESO 3.6-m telescope at La Silla. It is an upgraded version of COME-ON-PLUS, the VLT AO prototype, which already produced significative astrophysical results in a wide range of fields, from planetology to extragalactic astrophysics. ADONIS is now allowing the astronomer to use adaptive optics as a common user instrument thanks to the implementation of an open artificial intelligence software that handles the large number of parameters needed to optimise the AO correction. We will describe the ADONIS system, including the two dedicated infrared cameras, summarize its performances and discuss the observing procedures. 相似文献
4.
Th. Berkefeld D. Schmidt D. Soltau O. von der Lühe F. Heidecke 《Astronomische Nachrichten》2012,333(9):863-871
The new 1.5‐m German solar telescope GREGOR at the Observatorio del Teide, Tenerife, is equipped with an integrated adaptive optics system. Although partly still in the commissioning phase, the system is already being used used for most science observations. It is designed to provide diffraction‐limited observations in the visible‐light regime for seeing better than 1.2″. We describe the AO system including the optical design, software, wavefront reconstruction, and performance (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
5.
自适应光学技术已经成为现代地基天文光学望远镜的重要部分。在世界各地的天文台中 ,许多大型光学望远镜的自适应光学系统正在建造 ,不少的系统已经投入使用。自适应光学技术经过二十多年的发展 ,取得了越来越多的令人激动的天文观测成果 ,自适应光学正在接近成熟并正向天文实际应用的阶段转化。本文根据近几年来自适应光学望远镜在天文中的应用 ,对其所取得的天文成果给予介绍 ,并讨论了自适应光学系统所能开展的天文研究课题。 相似文献
6.
Restricted by the observational condition and the hardware, adaptive optics can only make a partial correction of the optical images blurred by atmospheric turbulence. A postprocessing method based on frame selection and multi-frame blind deconvolution is proposed for the restoration of high-resolution adaptive optics images. By frame selection we mean we first make a selection of the degraded (blurred) images for participation in the iterative blind deconvolution calculation, with no need of any a priori knowledge, and with only a positivity constraint. This method has been applied to the restoration of some stellar images observed by the 61-element adaptive optics system installed on the Yunnan Observatory 1.2m telescope. The experimental results indicate that this method can effectively compensate for the residual errors of the adaptive optics system on the image, and the restored image can reach the diffraction-limited quality. 相似文献
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8.
J. Y. Hu 《Astrophysics and Space Science》1994,217(1-2):53-54
A high spatial resolution near infrared imaging system is being developed at Beijing Observatory. It is a joint-project with Institute of Optics and Electronics, CSA, and National Astronomical Observatory, Japan. The system contains a 512 × 512 PtSi CSD near infrared camera and a 21-element adaptive optics system and will be operated at Coudé focus of the 2.16 meter telescope at Xinglong Station, Beijing Observatory. The infrared camera will be fixed at Cassegrain focus with focus reducers too. 相似文献
9.
Carried with an astronomical adaptive optics (AO) system, this work reports the observational evidences of wave-front deformations dominated by sources of perturbation acting as phase slabs moving at a constant speed in front of the telescope aperture. Consequences for improved adaptive optics compensation are suggested. 相似文献
10.
为能够实时补偿大气湍流对月球激光测距带来的渡前倾斜量误差,采用相关跟踪自适应光学系统,并根据其大计算量、高实时性的要求,创新地设计了基于PCI-Express高速图像采集卡及其硬实时操作系统驱动程序,完成对扩展源目标大气倾斜量的实时补偿.详细介绍了整体系统的软硬件设计,给出了一种PCI-Express高速图像采集卡设计结果及其RTAI实时驱动程序的软件设计结果,完成了进一步提高图像传输速度,减小相关跟踪系统系统延迟,提高系统响应带宽的目标,最终实现了图像数据的实时传输(≤28 μS)及波前倾斜量的实时补偿(≤348 μS). 相似文献
11.
We present resolved near-infrared images of near-Earth Asteroid 2004 XP14, obtained with the adaptive optics system on Keck II during July 2006. This is the first time a near-Earth asteroid has been directly imaged from the ground. Our result illustrates the capabilities of adaptive optics and complements radar and spectral observations. 相似文献
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13.
云南天文台1m红外太阳望远镜是多功能、多波段的太阳望远镜,望远镜使用过程中主镜的热变形直接关系这系统的光学精度,建立光学系统的光机热结合的分析方法,可以直观的得到热辐射对光学系统的影响结果,使得望远镜的设计阶段就能评估热变形对系统的精度影响,确定光学元件是否满足要求. 相似文献
14.
A. Chalabaev E. Le Coarer P. Rabou Y. Magnard P. Petmezakis D. Le Mignant 《Experimental Astronomy》2002,14(3):147-181
The GraF instrument using a Fabry-Perot interferometer cross-dispersed with a grating was one of the first integral-field
and long-slit spectrographs built for and used with an adaptive optics system. We describe its concept, design, optimal observational
procedures and the measured performances. The instrument was used in 1997–2001 at the ESO3.6 m telescope equipped with ADONIS
adaptive optics and SHARPII+camera. The operating spectral range was 1.2–2.5 μm. We used the spectral resolution from 500
to 10 000 combined with the angular resolution of 0.1″–0.2″. The quality of GraF data is illustrated by the integral field
spectroscopy of the complex0.9″ × 0.9″ central region of η Car in the1.7 μm spectral range at the limit of spectral and angular
resolutions.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
15.
《天文和天体物理学研究(英文版)》2016,(12)
A first generation sodium Laser Guide Star Adaptive Optics System(LGS-AOS) was developed and integrated into the Lijiang 1.8 m telescope in 2013. The LGS-AOS has three sub-systems:(1) a 20 W long pulsed sodium laser,(2) a 300-millimeter-diameter laser launch telescope, and(3) a 37-element compact adaptive optics system. On 2014 January 25, we obtained high resolution images of an mV8.18 star,HIP 43963, during the first light of the LGS-AOS. In this paper, the sodium laser, the laser launch telescope,the compact adaptive optics system and the first light results will be presented. 相似文献
16.
Ray DuVarney Charlie Bleau Garry Motter Richard Dekany Mitchell Troy Gary Brack 《Experimental Astronomy》2001,11(3):237-249
SciMeasure, in collaboration with Emory University and the Jet Propulsion Laboratory, has developed a very versatile CCD controller for use in adaptive optics, optical interferometry, and other applications requiring high-speed readout rates and/or low read noise. The overall architecture of this controller system will be discussed and its performance using both EEV CCD39 and MIT/LL CCID-19 detectors will be presented. This controller is used in the adaptive optics system, developed by JPL, for the 200′′ Hale telescope at Palomar Mountain. Early diffraction-limited science results, recently achieved by the AO system, are presented. We gratefully acknowledge the financial support of NASA through SBIR contracts NAS8–97195 and NAS8–98081. 相似文献
17.
In this paper, we present simulation results of a ground-layer correction adaptive optics system (GLAO), based on four laser guide stars and a single deformable mirror. The goal is to achieve a seeing improvement over an 8-arcmin field of view, in the near-infrared (from 1.06 to 2.2 μm). We show results on the scaling of this system (number of subapertures, frame rates), and the required number of tip-tilt stars. We investigate the use for GLAO of both sodium and Rayleigh guide stars. We also show that if the lasers can be repositioned, the performance of the adaptive optics can be tailored to the astronomical observations. 相似文献
18.
The NASA/Marshall Space Flight Center's solar vector magnetograph system is described; this sytem allows measurements of all components of the Sun's photospheric magnetic field over a 5 × 5 or 2.0 × 2.0 arc min square field-of-view with an optimum time resolution of 100 s and an optimum signal-to-noise of 1600. The basic system components are described, including the optics, detector, digital system and associated electronics. Automatic sequencing and control functions are outlined as well as manual selections of system parameters which afford unique system flexibility. Results of system calibration and performance are presented, including linearity, dynamic range, uniformity, spatial and spectral resolutions, signal-to-noise, electro-optical retardation and polarization calibration. Scientific investigations which utilize the unique characteristics of the instrument are described and typical results are presented. 相似文献
19.
Ray DuVarney Charlie Bleau Garry Motter Richard Dekany Mitchell Troy Gary Brack 《Experimental Astronomy》2001,11(1):237-249
SciMeasure, in collaboration with Emory University and the Jet Propulsion Laboratory, has developed a very versatile CCD controller
for use in adaptive optics, optical interferometry, and other applications requiring high-speed readout rates and/or low read
noise. The overall architecture of this controller system will be discussed and its performance using both EEV CCD39 and MIT/LL
CCID-19 detectors will be presented. This controller is used in the adaptive optics system, developed by JPL, for the 200′′
Hale telescope at Palomar Mountain. Early diffraction-limited science results, recently achieved by the AO system, are presented.
We gratefully acknowledge the financial support of NASA through SBIR contracts NAS8–97195 and NAS8–98081.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
20.
M. Kasper D. P. Looze S. Hippler T. Herbst A. Glindemann T. Ott A. Wirth 《Experimental Astronomy》2000,10(1):49-73
The adaptive optics system ALFA differs in some aspects from systems like ADONIS and PUEO which have delivered scientific results since years. Interchangeable lenslet arrays with different numbers of subapertures and a deformable mirror with many more actuators than the number of corrected modesresult in some peculiarities in the calibration of the system and the reconstruction of incident wavefronts.We describe the design of ALFA's optics and its modal control architecture with a focus on a comparative study of the performance of different mode sets used to correct the wavefront aberrations. An outlook on our plans to improve and simplify the use of ALFA is given.The last section is dedicated to issues related to observing with ALFA in its present state. Expected Strehl ratios for different seeing conditions and guide star magnitudes are summarized in a table. AO observations in general, direct imaging and doing spectroscopywith ALFA in particular are discussed. 相似文献